diff --git a/nixos/modules/misc/ids.nix b/nixos/modules/misc/ids.nix
index 16eec9043212..51da1a2cfce0 100644
--- a/nixos/modules/misc/ids.nix
+++ b/nixos/modules/misc/ids.nix
@@ -110,6 +110,7 @@
       openldap = 99;
       memcached = 100;
       cgminer = 101;
+      munin = 102;
 
       # When adding a uid, make sure it doesn't match an existing gid.
 
@@ -199,6 +200,7 @@
       haproxy = 92;
       openldap = 93;
       connman = 94;
+      munin = 95;
 
       # When adding a gid, make sure it doesn't match an existing uid.
 
diff --git a/nixos/modules/services/monitoring/munin.nix b/nixos/modules/services/monitoring/munin.nix
index 153f49429029..39c4fb1aefac 100644
--- a/nixos/modules/services/monitoring/munin.nix
+++ b/nixos/modules/services/monitoring/munin.nix
@@ -173,10 +173,12 @@ in
       name = "munin";
       description = "Munin monitoring user";
       group = "munin";
+      uid = config.ids.uids.munin;
     }];
 
     users.extraGroups = [{
       name = "munin";
+      gid = config.ids.gids.munin;
     }];
 
   }) (mkIf nodeCfg.enable {